IPCS INCHEM Home
DICHLOROMONOFLUOROMETHANE
(cylinder)
ICSC: 1106
Peer-Review Status: 19.10.1999 Validated
Fluorodichloromethane
HCFC 21
Fluorocarbon 21 
CAS #: 75-43-4 RTECS #: PA8400000
UN #: 1029
EINECS #: 200-869-8
    Formula: CHCl2F
Molecular mass: 102.9

TYPES OF
HAZARD /
EXPOSURE
ACUTE HAZARDS / SYMPTOMS      PREVENTION      FIRST AID / FIRE FIGHTING
FIRE Not combustible. Gives off irritating or toxic fumes (or gases) in a fire.    In case of fire in the surroundings, use appropriate extinguishing media. 
EXPLOSION     In case of fire: keep cylinder cool by spraying with water. 
 
EXPOSURE      
Inhalation Confusion. Drowsiness. Unconciousness.  Use ventilation, local exhaust or breathing protection.  Fresh air, rest. Artificial respiration may be needed. Refer for medical attention. 
Skin ON CONTACT WITH LIQUID: FROSTBITE.  Cold-insulating gloves. Protective clothing.  ON FROSTBITE: rinse with plenty of water, do NOT remove clothes. Refer for medical attention . 
Eyes   Wear safety goggles or eye protection in combination with breathing protection.  First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention. 
Ingestion   Do not eat, drink, or smoke during work.   

SPILLAGE DISPOSAL
PACKAGING & LABELLING
Personal protection: self-contained breathing apparatus. Do NOT let this chemical enter the environment. Ventilation. NEVER direct water jet on liquid.   
EC Classification
 
UN Classification
UN Hazard Class: 2.2 
GHS Classification
 

EMERGENCY RESPONSE SAFE STORAGE
Transport Emergency Card: TEC (R)-20G2A.  Fireproof if in building. 

IMPORTANT DATA
Physical State; Appearance
COLOURLESS GAS OR COMPRESSED LIQUEFIED GAS WITH CHARACTERISTIC ODOUR. 

Physical dangers
The gas is heavier than air and may accumulate in lowered spaces causing a deficiency of oxygen. 

Chemical dangers
Decomposes on heating. This produces corrosive and highly toxic fumes (hydrogen chloride - see ICSC 0163; hydrogen fluoride - see ICSC 0283 and phosgene - see ICSC 0007). Reacts with powdered aluminium, zinc and magnesium. Reacts with acids and acid fumes. This produces highly toxic fumes of chlorides and fluorides. Attacks some forms of plastic, rubber and coatings. 

Occupational exposure limits
TLV: 10ppm as TWA; (ACGIH 2004).
MAK: 10 ppm, 43 mg/m³; Peak limitation category: II(2); (DFG 2008). 

Routes of exposure
The substance can be absorbed into the body by inhalation. 

Inhalation risk
A harmful concentration of this gas in the air will be reached very quickly on loss of containment. 

Effects of short-term exposure
The liquid may cause frostbite. The substance may cause effects on the central nervous system at high concentrations. Exposure far above the OEL could cause cardiac dysrhythmia. 

Effects of long-term or repeated exposure
The substance may have effects on the liver. 


PHYSICAL PROPERTIES ENVIRONMENTAL DATA
Boiling point: 8.9°C
Melting point: -135°C
Solubility in water, g/100ml at 20°C: 1 (poor)
Vapour pressure, kPa at 21°C: 159
Relative vapour density (air = 1): 3.8
Auto-ignition temperature: 522°C
Octanol/water partition coefficient as log Pow: 1.55  
This substance may be hazardous to the environment. Special attention should be given to its impact on the ozone layer. 

NOTES
High concentrations in the air cause a deficiency of oxygen with the risk of unconsciousness or death.
Check oxygen content before entering area.
No odour warning if toxic concentrations are present.
Do NOT use in the vicinity of a fire or a hot surface, or during welding.
Turn leaking cylinder with the leak up to prevent escape of gas in liquid state.
Freon21, Genetron 21, Arcton 7 and Algofrene type 5 are trade names.
Card has been partly updated in April 2005. See sections Emergency response, Occupational Exposure Limits. 

ADDITIONAL INFORMATION
 

IPCS
International
Programme on
Chemical Safety
WHO ILO EC Prepared in the context of cooperation between the International Programme on Chemical Safety and the European Commission
© IPCS 2004-2012
LEGAL NOTICE Neither the EC nor the IPCS nor any person acting on behalf of the EC or the IPCS is responsible for the use which might be made of this information.


    See Also:
       Toxicological Abbreviations